diff --git a/lldb/source/API/SBProcess.cpp b/lldb/source/API/SBProcess.cpp
--- a/lldb/source/API/SBProcess.cpp
+++ b/lldb/source/API/SBProcess.cpp
@@ -804,6 +804,12 @@
 
   size_t bytes_read = 0;
 
+  if (!dst) {
+    sb_error.SetErrorStringWithFormat(
+        "no buffer provided to read %zu bytes into", dst_len);
+    return 0;
+  }
+
   ProcessSP process_sp(GetSP());
 
 
diff --git a/lldb/test/API/python_api/process/TestProcessAPI.py b/lldb/test/API/python_api/process/TestProcessAPI.py
--- a/lldb/test/API/python_api/process/TestProcessAPI.py
+++ b/lldb/test/API/python_api/process/TestProcessAPI.py
@@ -60,6 +60,20 @@
             exe=False,
             startstr=b'x')
 
+        # Try to read an impossibly large amount of memory; swig
+        # will try to malloc it and fail, we should get an error 
+        # result.
+        error = lldb.SBError()
+        content = process.ReadMemory(
+                val.AddressOf().GetValueAsUnsigned(), 
+                0xffffffffffffffe8, error)
+        if error.Success():
+            self.fail("SBProcessReadMemory claims to have "
+                      "successfully read 0xffffffffffffffe8 bytes")
+        if self.TraceOn():
+            print("Tried to read 0xffffffffffffffe8 bytes, got error message: ",
+                  error.GetCString())
+
         # Read (char *)my_char_ptr.
         val = frame.FindValue("my_char_ptr", lldb.eValueTypeVariableGlobal)
         self.DebugSBValue(val)